<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="default" namespace="/" extends="struts-default"><action name="helloworld" class="com.imooc.action.HelloWorld" ><result>/result.jsp</result></action>?<action name="addAction"? method="add" class="com.imooc.action.HelloWord"><result name="add">/add.jsp</result></action><action name="updateAction" class="com.imooc.action.HelloWord" method="update"><result name="update">/update.jsp</result></action></package><constant name="struts.enable.DynamicMethodInvocation" value="false"></constant></struts>??? package com.imooc.action;import com.opensymphony.xwork2.ActionSupport;public class HelloWorld extends ActionSupport{?? ?public String add(){?? ??? ?return "add";?? ?}?? ?public String update(){?? ??? ?return "update";?? ?}?? ?@Override?? ?public String execute() throws Exception {?? ??? ?// TODO Auto-generated method stub?? ??? ?System.out.println("Action執(zhí)行");?? ??? ?return SUCCESS;?? ??? ??? ?}}輸入 ：http://localhost:8080/S11/addAction.action? 出現錯誤如下：type Status reportmessage /S11/addAction.actiondescription The requested resource is not available.